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mTouch Sensing Solutions: Touch Screen Controllers
Analog Resistive Technology
Microchip’s AR1000 Series Key Features
■ Frees host from burden of touch data processing
■ Enables supply chain optimization via universal sensor
support
???? Turnkey touch solution
???? Built-in decoding and advanced ?ltering—
no touch code to write
???? Power-saving sleep and external wake up modes
???? Universal 4, 5 and 8 wire sensor support
???? SPI, I 2 C?, UART or USB interfaces
???? 4?×?4 QFN package
???? Free drivers for most major platforms
Microchip offers a broad portfolio of advanced touch
solutions for projected capacitive and resistive touch
screen applications with the following advantages:
■ High Flexibility : Royalty free source code model,
increased design flexibility with options to integrate
touch sensing with application code on a single
MCU, low cost, low power solutions to reduce total
system cost.
■ Sophisticated : Advanced touch screen solutions use
sophisticated proprietary touch screen decoding
algorithms to send your application fully processed
and reliable touch coordinates.
■ Easy Integration : Designers can add touch screen
technology to their application without extensive
development time, risk or cost.
Projected Capacitive vs. Resistive
Microchip presents both projected capacitive and resistive
touch solutions to allow designers to choose the best ?t for
their touch screen design.
■ Projected capacitive technology provides high
durability, good optics and multi-touch capability
which enable gestures.
■ Resistive touch is a good choice for a low cost,
easy to integrate solution that accepts ?nger,
stylus or glove input.
Touch Sensing Technology Comparison
How Analog Resistive Works
■ Two conductive coated polyester layers separated by a
spacer layer
■ When touched, top (flex) layer moves past spacer layer
and contacts bottom (stable) layer
■ Point of contact creates voltage divider in the X and Y
directions
Development Tools for Resistive Touch
mTouch AR1000 Development Kit (DV102011)
■ UART output (AR1011)
■ SPI or I 2 C output (AR1021)
■ Low cost with advanced
touch functionality
■ Communication support for
I 2 C/SPI/UART
■ Built in decoding and advanced ?ltering
Cost for screen < 6"
Cost for screen > 10"
Optics
Screen Life
Ease of Integration
Multi-Touch
Touch Object
www.microchip.com/mtouch
Analog
Resistive
Lowest
Lowest
75%
Good
Easy
Limited
Finger, Stylus/
Glove
Projected
Capacitive
Low
High
90%
Better
Moderate
Yes
Finger
mTouch AR1100 Development Kit (DV102012)
■ Auto detect USB or
UART Communication
(AR1100 Chip)
■ Auto detect USB or
RS-232 Communication
(AR1100 Board)
■ Low cost, high performance USB resistive
■ USB and advanced 9 and 25 point calibration
■ USB mouse or single touch win 7 digitizer
■ Field flash updatable (UART and USB)
■ Chip and board product for fast integration
Microchip Human Interface Solutions
5
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